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<head>
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Input Task</title>
</head>
<body>
<h2 id="input">Input</h2>
<h3>Description</h3>
<p>Allows user interaction during the build process by prompting for input. To do so, it uses the
configured <a href="../inputhandler.html">InputHandler</a>.</p>
<p>The prompt can be set via the <var>message</var> attribute or as character data nested into the
element.</p>
<p>Optionally a set of valid input arguments can be defined via the <var>validargs</var>
attribute. <code>Input</code> task will not accept a value that doesn't match one of the
predefined.</p>
<p>Optionally a property can be created from the value entered by the user. This property can then
be used during the following build run. <code>Input</code> then behaves
as <a href="property.html">property task</a> which means that existing properties cannot be
overridden. <em>Since Apache Ant 1.6</em>, <code><input></code> will not prompt for input if
a property should be set by the task that has already been set in the project (and the task wouldn't
have any effect).</p>
<p>Historically, a regular complaint about this task has been that it echoes characters to the
console, this is a critical security defect, we must fix it immediately, etc, etc. This problem was
due to the lack in early versions of Java of a (fully functional) facility for handling secure
console input. In Java 6 that shortcoming in Java's API was addressed and Ant versions 1.7.1 and
1.8 have added support for Java 6 secure console input feature (see <a href="#handler.type">handler
type</a>).</p>
<p>IDE behaviour depends upon the IDE: some hang waiting for input, some let you type it in. For
this situation, place the password in a (secured) property file and load in before
the <code>input</code> task.</p>
<h3>Parameters</h3>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>message</td>
<td>the Message which gets displayed to the user during the build run.</td>
<td>No</td>
</tr>
<tr>
<td>validargs</td>
<td>comma separated String containing valid input arguments. If set, <code>input</code> task
will reject any input not defined here. Comparison of input to <var>validargs</var> is case
sensitive. If you want <q>a</q> and
<q>A</q> to be accepted you will need to define both arguments within <var>validargs</var>.</td>
<td>No</td>
</tr>
<tr>
<td>addproperty</td>
<td>the name of a property to be created from input. Behaviour is equal
to <a href="property.html">property task</a> which means that existing properties cannot be
overridden.</td>
<td>No</td>
</tr>
<tr>
<td>defaultvalue</td>
<td>Defines the default value of the property to be created from input. Property value will be
set to default if no input is received.</td>
<td>No</td>
</tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>Handler</h4>
<p><em>Since Ant 1.7</em>, a nested <code><handler></code> element can be used to specify
an <code>InputHandler</code>, so that different <code>InputHandler</code>s may be used among
different <code>Input</code> tasks.</p>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr id="handler.type">
<td>type</td>
<td>one of <q>default</q>, <q>propertyfile</q>, <q>greedy</q>, or <q>secure</q> (<em>since Ant
1.8</em>).</td>
<td rowspan="3">One of these</td>
</tr>
<tr>
<td>refid</td>
<td class="left">Reference to an <code>InputHandler</code> defined elsewhere in the
project.</td>
</tr>
<tr>
<td>classname</td>
<td class="left">The name of an <code>InputHandler</code> subclass.</td>
</tr>
<tr>
<td>classpath</td>
<td>The classpath to use with <var>classname</var>.</td>
<td>No</td>
</tr>
<tr>
<td>classpathref</td>
<td>The refid of a classpath to use with <var>classname</var>.</td>
<td>No</td>
</tr>
<tr>
<td>loaderref</td>
<td>The refid of a classloader to use with <var>classname</var>.
</td>
<td>No</td>
</tr>
</table>
<p>The classpath can also be specified by means of one or more nested <code><classpath></code>
elements.</p>
<h3>Examples</h3>
<p>Pause the build run until return key is pressed when using
the <a href="../inputhandler.html#defaulthandler">default InputHandler</a>, the concrete behavior is
defined by the <code>InputHandler</code> implementation you use.</p>
<pre><input/></pre>
<p>Display the message <q>Press Return key to continue...</q> and pause the build run until return
key is pressed (again, the concrete behavior is implementation dependent).</p>
<pre><input>Press Return key to continue...</input></pre>
<p>Display the message <q>Press Return key to continue...</q> and pause the build run until return
key is pressed (see above).</p>
<pre><input message="Press Return key to continue..."/></pre>
<p>Display the message <q>All data is going to be deleted from DB continue (y/n)?</q> and
require <q>y</q> to continue build or <q>n</q> to exit build with following message <q>Build aborted
by user.</q>.</p>
<pre>
<input message="All data is going to be deleted from DB continue (y/n)?"
validargs="y,n"
addproperty="do.delete"/>
<condition property="do.abort">
<equals arg1="n" arg2="${do.delete}"/>
</condition>
<fail if="do.abort">Build aborted by user.</fail>
</pre>
<p>Display the message <q>Please enter db-username:</q> and set the property <code>db.user</code> to
the value entered by the user.</p>
<pre>
<input message="Please enter db-username:"
addproperty="db.user"/></pre>
<p>Same as above, but set <code>db.user</code> to the value <q>Scott-Tiger</q> if the user enters no
value (simply presses <q>return</q>).</p>
<pre>
<input message="Please enter db-username:"
addproperty="db.user"
defaultvalue="Scott-Tiger"/></pre>
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